-Application permission.
These can be a proper indicator.
These can be faked, so I would not take this alone into account; it needs more.
No, just no. There are so many fake reviews - in both directions! - you better not rely on those.
Many very good wallets are open source and don't have support page as you'd expect.
Support is usually an indicator of a private product, usually meaning custodial service, which brings another list of risks (KYC, "not your keys, not your coins").
I think that best is to check/ask on bitcointalk for good wallets. You will get the names and official websites. And the official websites will have the correct link to the correct wallet (and also ways to check it's the correct one).
I would not google search for the official website, since nowadays those also get cloned and get high ranks in search engines.